1868994563 has 4 divisors (see below), whose sum is σ = 1869608208. Its totient is φ = 1868380920.

The previous prime is 1868994541. The next prime is 1868994583. The reversal of 1868994563 is 3654998681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3654998681 = 193 ⋅18937817.

It is a cyclic number.

It is not a de Polignac number, because 1868994563 - 2¹² = 1868990467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868994503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302231 + ... + 308352.

It is an arithmetic number, because the mean of its divisors is an integer number (467402052).

Almost surely, 2^1868994563 is an apocalyptic number.

1868994563 is a deficient number, since it is larger than the sum of its proper divisors (613645).

1868994563 is an equidigital number, since it uses as much as digits as its factorization.

1868994563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613644.

The product of its digits is 11197440, while the sum is 59.

The square root of 1868994563 is about 43231.8697606291. The cubic root of 1868994563 is about 1231.7881241152.

The spelling of 1868994563 in words is "one billion, eight hundred sixty-eight million, nine hundred ninety-four thousand, five hundred sixty-three".